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Teen-agers searching for a treasure hidden at an old farm find a secret message written in code.

The bestselling authors of "Beyond the Millennium" and "The Fourth Millennium" bring readers this prophetic thriller based on the idea that there is a secret co

In this fast-paced mystery, a young protagonist receives a mysterious note, setting off a chain of events that lead them to unravel a hidden code. As they decip

"Can a secret code help save someone's life? Find out as you read about Kathryn's adventure in the Arizona desert."--

Secret codes are the best fun! This book includes lots of space to write your secrets. If you want to keep your secrets really secret the pages at the back of t